# The Road Vehicles (Construction and Use) Regulations 1986, Paragraph 5


For the purposes of this Part of this Schedule an engine shall be regarded as running at a fast idling speed if—
(a) the vehicle is of a description specified in the Annex to the emissions publication and the engine is running at a rotational speed between the minimum and maximum limits shown against that description of vehicle in columns 3(e) and (f) respectively of that Annex; or
(b) the vehicle is not of such a description and the engine is running at a rotational speed between 2,500 and 3,000 revolutions per minute.

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Source: https://www.legislation.gov.uk/uksi/1986/1078/schedule/7B/paragraph/5 (the official version)
Page: https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/schedule-7B/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.